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    <title>Document</title>
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<script>
    // String Number Boolean null undefined 


    // 算数运算符  + - *  /  %

    // 数字和数字运算  
    // var a = 10;
    // var b = 3;
    // var c = a + b;
    // var c = a - b;
    // var c = a * b;
    // var c = a / b;
    // var c = a % b;   // 10 / 3 = 3 ... 1
    // console.log(c);


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